Aisagaliev, S A, M N Kalimoldayev, and E M Pozdeeva. “On the Boundary Problem of Ordinary Differential Equations”. Journal of Mathematics, Mechanics and Computer Science 75, no. 4 (December 27, 2012): 4–21. Accessed December 22, 2024. https://bm.kaznu.kz/index.php/kaznu/article/view/154.